What was one of the precursors that led to American involvement in the World War 1 ?

Wilson cited Germany's violation of its pledge to suspend unrestricted submarine warfare in the North Atlantic and the Mediterranean, as well as its attempts to entice Mexico into an alliance against the United States, as his reasons for declaring war

Explanation:

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At the beginning of 1915, Germany started a policy of unrestricted warfare in the Atlantic ocean. Germany sunk multiple United States ships without warning. On May 7th, Germany sunk the Lusitania without warning. There were 1,959 passengers on the ship, and 1,198 of the passengers were killed. 128 of the killed passengers were Americans. In 1917, Germany resumed a policy of unrestricted warfare in the Atlantic. Several more US ships were sunk, and this resulted in the United States severing diplomatic ties with Germany. America also had a financial stake in the war. Many American businesses and bank gave huge loan to the Allied forces. If the Allies lost the war then they probably weren’t going to get their money back. In January 1917, Germany sent the Zimmerman telegram to the German diplomatic representative in Mexico. I proposed a secret alliance between the two countries. If the Central Powers won the war, Mexico would get back the territory they lost to the United States. The telegram was intercepted by the British, and after it was decrypted it was sent to the United States. The combination of all of these thing caused the United States to join the war. On April 6th, the United States declared war, and the first American troops arrived in Europe in June.

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